Process for the manufacture of seamless metallic hollow bodies by means of matrix and die.



i c1503.: 7 raoonss FOR THE MANUFACTURE OP-SEAMLESS METALLIC" HOLLOWBODIES, I I

BY MEANS OF MATRIX 'ANDDIE JULY 9,1003.

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UNIT STATES GEORG KAUB,

PATENT orrion.

OF ESSEN-O N-THE-RUHR, GERMANK ASSIGNOR TO' FRIED. KRUPP, OFESSEN-ON-THE-RUHR, GERMANY.

PROCESS FOR THE MANUFACTURE OF SEAMLESS METALLIC HOLLOW BODIES BY MEANSOF MATRlX AND DIE.

To all whom it may concern.-

Be it known that L'GEORG KAUB, a'subject of the Emperor of Germany, anda resident of Essen-on-the Ruh r, Germany, have invented certain new anduseful Improvements in -Processes for the Manufacture of SeamlessMetallic Hollow Bodies by Means of Matrix and Die, of which thefollowing is a specification.

The invention relates to the process of manufacturing seamless, metallichollow bodies in which a heated metallic block is introduced into amatrix and perforated by means of a Figures 1, 3, and4 are verticalsectional.

views showing progressive steps in the process of punching out a core bythe present process in the manufacture of a seamless hollow metallicbody, and Fig. 2 is a horizontal section on the line 2 2 of Fig. 1.Figs. 5 to 10, inclusive, are horizontal sectional views suggesting someof the various forms of seamless bodies that may be produced accordingto the present invention.

Referring more particularly to Figs. 1 to 4:, which relate to theproduction of a hollow cylindrical body, A represents the matrix, whichis turned out in the form of a cylinder with such an internal diameteras will permit the metallic block to fit accurately within it.

In the base of the matrix is provided an opening a, which is covered bya plate of, Figs. 1 and 2. Above the matrix is the press-die B, securedto the piston of a hydraulic press or the like. This press-die isconstructed with an annular transverse section and is so guided in itsmovements that it remains coaxial with the matrix. After theheatedmetallic block C is introduced into the matrix, as shown in Fig.1, the press is put under pres- Specification of Letters Patent.Application filed Jul 9,1903. Serial No. 164,882.

' Patented Aug. 1, 1905.

sure and the die I) presses. gradually into the work (1. By thepenetration of the die a portion opening a of. the matrix and raises theplate (4 Finally the core o is removed in a suitable manner-as, forinstance, by the use of a hollow drill or by punching out the base.

This core might also be removed in the pressing operation by a specialconstruction of loase-plate. Such an arrangement is shown in Fig. 4,wherethe' base-plate a is provided with a recess a in which the end ofthe pressdie may enter at the completion of its stroke. In this way, itwill be observed, the core 0 is sheared offfrom the material of thetubular wall, so that a hollow tubular body results from thesimpleaction of the press.

If it is desired to produce a hollow body closed at one end, thepress-die is caused to penetrate to a point distant from the baseplate acorresponding to the strength desired for the closure of the end of thebore, and the core 0' is then separated from the basein a suitablemanneras, forexample, by the use of wedges.

From the foregoing description of the invention it will be obviouswithout further description that in comparison with a solid pressdie ahollow die, by reason of its lesser volume for a given diameter,requires a very much less pressure and expenditure of work. Consequentlysmaller presses .may be employed for the manufacture of comparativelylarge tubular bodies. A further advantage arises from the use of ahollow press-die in that with cast metallic blocks from which it isdesired to construct seamless tubular'bodies by pressing the centralportion of the block, which often contains porous metal or imperfections, is removed by the hollow press-die.

and only sound material is forced into the walls of the completedarticle.

Obviously the cross-section of the article to be produced may beof anydesired shape by suitably selecting the form of the matrix and of thedie. Various shapes are suggested in Figs. 5 to 10, inclusive. It willbe observed that the exterior form need not correspond with the interiorand also that the metallic block introduced into the matrix beforepressing need not correspond with the form of the matrix. A round blockmight be introduced ;into a square matrix, as shown in Fig. 6, or

a square block can be introduced into a round matrix. In such cases thepressing operation will cause the metal to How into the unfilled spaceor spaces between the block and the matrix.

In presence of PETER LIEBER, WILLIAM Essnnwnm.

